email@example.com (Vincent Quinn) writes:
>As there have been a few postings about PC Transporter recently, I thought
>I'd make my contribution.
>_Firstly_, I want to hook up a standard PC 360K, 5.25 floppy drive as drive B
>(I have an Apple 3.5 as drive A). Problem is, I don't have a complete pinout.
Mini/Micro Floppy Interface
Pin# Description Alternate Functions
---- ----------- -------------------
1 GND Eject, Disk Change Reset
3-33 Odd pins are GND
2 High Density
4 Head Load In Use, Eject
6 Drive Select 3
8 Index Pulse +
10 Drive Select 0 Motor On A \ IBM twisted
12 Drive Select 1 Drive Select B \ cable - both
14 Drive Select 2 Drive Select A / drives are
16 Motor On Motor On B / strapped DS1
22 Write Data
24 Write Enable
26 Track Zero +
28 Write Protect +
30 Read Data +
32 Select Head
34 Disk Changed + Ready +
+ signal from drive to controller
>I'm assuming that the pinout of the PCT 19-pin drive connector is the same
>that of the IIGS SmartPort (that's logical, since Apple 3.5 drives work
>perfectly with the PCT) and that the 5.25 drive comes first in the chain
>indicated by the PCT manual). So a 19-pin pass-through connector needs to
>added at the rear of the PC drive for chaining the Apple 3.5" drive to. OK.
Hang on, there is no way you are going to be able to connect a PC 360KB drive
to an Apple 19 pin disk port (well, I do have a drive that is a standard
PC style drive with an adapter board that makes it emulate a Disk ][ drive)
and read PC 360KB disks.
Apple 5.25" drives use the 4 step lines to manually step the head in or out.
IBM 5.25" drives hold the Direction line high or low and send a single pulse
on the Step line to move the head in or out. Ditto for IBM 3.5" drives.
Apple 3.5" drives use the 4 step lines to select a comand and another line
to strobe it into the drive (or something like that).
David Wilson School of IT & CS, Uni of Wollongong, Australia firstname.lastname@example.org
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